package com.godfrey.config;

import com.godfrey.pojo.User;
import com.godfrey.service.UserService;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.*;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.session.Session;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.subject.Subject;
import org.springframework.beans.factory.annotation.Autowired;

/**
 * description : 自定义Realm
 *
 * @author godfrey
 * @since 2020-06-02
 */
public class UserRealm extends AuthorizingRealm{

    @Autowired
    UserService userService;

    //授权
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principalCollection) {
        System.out.println("执行了=>授权doGetAuthorizationInfo");

        SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();

        //获取当前登录的对象
        Subject subject = SecurityUtils.getSubject();
        User currentUser = (User) subject.getPrincipal();

        //设置当前用户的权限
        info.addStringPermission(currentUser.getPerms());

        return info;
    }

    //认证
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authenticationToken) throws AuthenticationException {
        System.out.println("执行了=>认证doGetAuthenticationInfo");

        UsernamePasswordToken userToken = (UsernamePasswordToken) authenticationToken;

        //连接数据库，取用户名、密码
        User user = userService.queryUserByName(userToken.getUsername());

        if (user==null){
            return null;//抛出异常 UnknownAccountException
        }

        Subject currentSubject = SecurityUtils.getSubject();
        Session session = currentSubject.getSession();
        session.setAttribute("loginUser",user);

        //密码认证~shiro做
        return new SimpleAuthenticationInfo(user,user.getPwd(),"");
    }
}
